The narwhals are in the top of the pyramids of foods. Which means their position of the in the food chain was tertiary consumer. They are also carnivores, which meant they mostly ate fishes, crabs and those sea creatures. Here's a menu from them: Greenland halibut is delicious to them in order to gain fat and protein, cod is a way to gain sodium, Squid and shrimp gives them potassium....... Meanwhile, there's barely no animals could eat narwhals. It's not only because they are the top predators in the sea, but also they lived together and make sure that their fellow isn't attacked. Narwhals are hard to find food right now because human's pollutions are breaking the environments. So many of it's food is died by it. which means Narwhals are hard hard to find food because of that.